...and get them reading. CBC Books posted a list of Batman non-fiction books you can highlight at your library for fans of the dark knight.
» Becoming Batman: The Possibility of a Superhero by E. Paul Zehr
» Batman: The Complete History by Les Daniels
» Batman and Psychology: A Dark and Stormy Knight by Travis Langley
» The Essential Batman Encyclopedia by Robert Greenberger
The article gives a brief summary of each, so head on over.